Battery cells, solar cells and photovoltaic modules

Abstract

A battery cell, a solar cell, and a photovoltaic module are provided, each having a front surface of the battery cell with a plurality of front surface connection positions spaced apart along a first direction, each having a plurality of first connection parts spaced apart along a second direction, and a rear surface of the battery cell with a plurality of back surface connection positions spaced apart along the first direction, each having a plurality of second connection parts spaced apart along the second direction, wherein the first connection parts at two adjacent front surface connection positions are offset from each other and / or the second connection parts at two adjacent back surface connection positions are offset from each other. This battery can reduce the risk of deterioration in the reliability of the photovoltaic module.

Description

[Technical Field]

[0001] (CROSS-REFERENCE TO RELATED APPLICATIONS) This application claims priority from a Chinese patent application bearing application number 2023114667344 and entitled "Battery Cell, Solar Cell and Photovoltaic Module" filed with the State Intellectual Property Office of the People's Republic of China on November 3, 2023, the entire contents of which are incorporated herein by reference.

[0002] The present application relates to the technical field of photovoltaics, and in particular to battery cells, solar cells and photovoltaic modules. [Background technology]

[0003] In the field of photovoltaics, when manufacturing solar cells, such as batteries without busbar electrodes or batteries with narrow busbar electrodes, adhesive is printed on the battery cells, and a pressing process is used to achieve close contact between the metal interconnect strip and the battery cell. After the adhesive is cured, the metal interconnect strip and the battery cell are bonded together. In conventional processes, the adhesive dots are generally printed in a flat array format, with the printed adhesive dots being the same for each busbar electrode on the battery cell and corresponding to each other on the front and back sides. The metal interconnect strip is then placed on the adhesive dots and pressed with a press pin or press plate to cure the adhesive dots. Because the adhesive dots on the front and back sides of the battery cell are corresponding to each other, microcracks are likely to occur in the battery cells during the curing and lamination processes. In addition, due to the uneven height of the adhesive dots and the uneven pressure during crimping, some of the fine electrodes on the battery cells cannot effectively contact the metal interconnect strip, which makes it easy for the phenomenon of temporary connection to occur, resulting in the problem of shadows appearing in the EL test. The shadows that appear in the EL test are usually equivalent to the width of two to three fine electrodes, which not only affects the power of the solar power module but also poses the risk of reduced reliability and is prone to micro-cracks. Summary of the Invention [Problem to be solved by the invention]

[0004] Based on this, it is necessary to provide the following battery cell: The battery cell of the present application can effectively optimize the temporary connection problem, suppress the power loss caused by the temporary connection, reduce the risk of deterioration in the reliability of the photovoltaic module, and effectively control the problem of micro-cracks in the battery cell, reduce the loss of the battery cell, and reduce the performance degradation rate of the photovoltaic module. [Means for solving the problem]

[0005] In one embodiment of the present application, a battery cell is provided.

[0006] a battery cell, the battery cell having a plurality of front surface connection work positions provided on a front surface thereof, the front surface connection work positions being distributed at intervals along a first direction from one side of the battery cell to the opposite side thereof, and each of the front surface connection work positions having a plurality of first connection portions distributed at intervals along a second direction; a battery cell having a plurality of back surface connection work positions provided on a rear surface thereof, the back surface connection work positions being distributed at intervals along the first direction, and each of the back surface connection work positions having a plurality of second connection portions distributed at intervals along the second direction; The multiple first connection portions on two adjacent surface connection work positions are distributed with their positions offset from each other, and / or the multiple second connection portions on two adjacent back surface connection work positions are distributed with their positions offset from each other.

[0007] In some embodiments, the second direction is an extension direction of metal interconnect strips, and the first direction is perpendicular to the second direction.

[0008] In some embodiments, the plurality of front surface connection work positions and the plurality of back surface connection work positions correspond one-to-one along the first direction, the plurality of first connection portions constitute first connection members, the plurality of second connection portions constitute second connection members, and at least one pair of corresponding first connection members on the front surface connection work positions and second connection members on the back surface connection work positions are distributed with offset positions along the second direction in the thickness direction of the battery cell.

[0009] In some embodiments, the first connection portion is formed by printing, coating, or dispensing.

[0010] In some embodiments, the second connecting portion is formed by printing, coating, or dispensing.

[0011] In some embodiments, the first connection portion has a dot-like shape, a line-like shape, or a combination of a dot-like shape and a line-like shape.

[0012] In some embodiments, the second connection portion has a dot-like shape, a line-like shape, or a combination of a dot-like shape and a line-like shape.

[0013] In some embodiments, the spacing between two adjacent surface-connecting work locations is equal.

[0014] In some embodiments, the spacing between two adjacent back-connection operation locations is equal.

[0015] In some embodiments, the spacing between two adjacent front-side connection operation positions is equal to the spacing between two adjacent back-side connection operation positions.

[0016] In some embodiments, the spacing between two adjacent first connection portions at the surface connection operation position is equal.

[0017] In some embodiments, the intervals between two adjacent second connection portions at the rear connection operation position are equal.

[0018] In some embodiments, the spacing between two adjacent first connection portions and the spacing between two adjacent second connection portions are equal.

[0019] In one embodiment of the present application, there is further provided a solar cell.

[0020] The solar cell includes a metal interconnection strip, an adhesive member, and a plurality of the battery cells, the plurality of battery cells being arranged in sequence, with each adjacent two of the battery cells being connected by a plurality of the metal interconnection strips, the adhesive members being provided on a plurality of first connection portions on the front connection work positions of the battery cells, and the adhesive members being provided on a plurality of second connection portions on the back connection work positions of the battery cells, with a portion of the metal interconnection strip being connected to the adhesive member on the front connection work position of one of the two adjacent battery cells, and another portion of the metal interconnection strip being connected to the adhesive member on the back connection work position of the other of the two adjacent battery cells.

[0021] An embodiment of the present application further provides a photovoltaic module.

[0022] The photovoltaic module includes the solar cell. [Effects of the Invention]

[0023] The above-described battery cell effectively optimizes temporary connections, suppresses power loss due to temporary connections, reduces the risk of reliability degradation of the solar photovoltaic module, and effectively controls microcracks in the battery cells, reducing battery cell losses and the performance degradation rate of the solar photovoltaic module. Specifically, the present application changes the position of adhesive dots on adjacent busbar electrodes and offsets the positions of adhesive dots printed on the front and back surfaces of the battery cells to reduce shadows in EL tests, avoid power abnormalities in the solar photovoltaic module, and improve the reliability of the solar photovoltaic module. The present application changes the position of adhesive dots on the front and back surfaces of the battery cells to ensure a reliable bond between the metal interconnect strip and the adhesive dots, preventing temporary connections, thereby improving the microcracks in the battery cells during the manufacturing process and reducing the performance degradation rate of the solar photovoltaic module.

[0024] In order to more clearly explain the embodiments of the present invention or the technical solutions of the prior art, the drawings necessary for describing the embodiments or the prior art will be briefly described. The drawings described below are only shown in the embodiments of the present invention, and it is clear that those skilled in the art can obtain drawings of other embodiments based on these drawings without any creative efforts.

[0025] For a more complete understanding of the contents and advantageous advantages of the present application, reference is now made to the following drawings, in which like reference numerals refer to like elements, and in which: [Brief explanation of the drawings]

[0026] [Figure 1] 1 is a schematic diagram of a battery cell according to an embodiment of the present application. [Figure 2] 1 is a schematic diagram of a side view of a battery cell according to an embodiment of the present application. [Figure 3] FIG. 2 is a schematic diagram of a partial configuration of the battery cell shown in FIG. DETAILED DESCRIPTION OF THE INVENTION

[0027] In order to make the above-mentioned objects, features, and advantages of the present application clearer and easier to understand, the following describes in detail specific embodiments of the present application with reference to the drawings. In the following description, many specific details are set forth to facilitate a thorough understanding of the present application. However, the present application can be embodied in many other forms different from those described herein, and those skilled in the art can make similar modifications without departing from the content of the present application, so the present application is not limited to the specific embodiments disclosed below.

[0028] In describing the present application, it should be understood that orientations or positional relationships indicated by terms such as "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like, are based on the orientations or positional relationships shown in the drawings, and are intended merely to facilitate and simplify the description of the present application, and do not indicate or imply that such devices or elements must have a particular orientation or be configured and operated in a particular orientation, and therefore should not be understood as limiting the present application.

[0029] In this application, unless otherwise clearly specified or limited, the terms "attached," "coupled," "connected," "fixed," etc. should be understood in a broad sense, and may mean, for example, a fixed connection, a detachable connection, an integrated connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediary, a communication between two elements, or a mutually operative relationship between two elements. Those skilled in the art can understand the specific meanings of the above terms in this application according to specific circumstances.

[0030] In this application, unless otherwise clearly specified or limited, a first feature being "above" or "below" a second feature may mean that the first feature and the second feature are in direct contact with each other, or that the first feature and the second feature are in indirect contact with each other via an intervening object. Furthermore, a first feature being "above," "above," or "upper side" of a second feature may mean that the first feature is directly below or diagonally above the second feature, or simply that the horizontal height of the first feature is higher than that of the second feature. Furthermore, a first feature being "above," "below," or "below" a second feature may mean that the first feature is directly below or diagonally above the second feature, or simply that the horizontal height of the first feature is higher than that of the second feature.

[0031] In the description of this application, "some" means one or more, "plurality" means two or more, "greater than," "less than," "more than," etc. are understood to be exclusive of the number, and "greater than," "less than," "within," etc. are understood to be inclusive of the number. References such as first and second are merely for distinguishing technical features and should not be understood as indicating or implying relative importance, implying the number of technical features indicated, or implying the context of the technical features indicated.

[0032] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. As used herein, the terms used in the specification of this application are only for the purpose of describing specific examples and are not intended to limit the scope of this application. As used herein, the term "and / or" includes any and all combinations of one or more of the associated listed items.

[0033] The embodiments of the present application provide a battery cell 10 that solves at least one of the following problems in the prior art: the adhesive dots are printed in the same position on both the front and back of the battery cell 10, which makes the battery cell 10 prone to microcracks during the curing and lamination processes; and the adhesive dots have varying heights and the pressure applied during crimping is not uniform, which prevents some fine electrodes on the battery cell 10 from effectively contacting the metal interconnect strips, making it prone to temporary connections, which can cause shadows during EL testing, affecting the power of the photovoltaic module and risking reduced reliability. The battery cell 10 will now be described with reference to the drawings.

[0034] The battery cell 10 provided in the examples of the present application is illustratively as shown in Figure 1, which is a structural schematic diagram of the battery cell 10 provided in the examples of the present application. The battery cell 10 according to the present application can be used in the production and manufacturing of solar cells in the field of photovoltaic power generation.

[0035] To more clearly explain the structure of the battery cell 10, the battery cell 10 will be described below with reference to the drawings.

[0036] 1 exemplarily shows a battery cell 10 having a plurality of surface connection work positions 100 provided on the surface of the battery cell 10, and the surface connection work positions 100 refer to the area indicated by the dashed line frame in FIGS. 1 and 2, where only a portion of the surface connection work positions 100 is shown in FIGS. 1 and 2. The plurality of surface connection work positions 100 are distributed at intervals along a first direction from one side of the battery cell 10 to the opposite side. Each surface connection work position 100 has a plurality of first connection portions 101 distributed at intervals along a second direction.

[0037] A plurality of backside connection work positions 200 are provided on the backside of the battery cell 10. The backside connection work positions 200 are shown in the area enclosed by the dashed line in FIG. 2, where only a portion of the backside connection work positions 200 is illustrated. The plurality of backside connection work positions 200 are distributed at intervals along the first direction. Each backside connection work position 200 has a plurality of second connection portions 201 distributed at intervals along the second direction.

[0038] The plurality of first connection portions 101 at two adjacent front surface connection work positions 100 are distributed with offset positions relative to each other. The plurality of second connection portions 201 at two adjacent back surface connection work positions 200 are distributed with offset positions relative to each other.

[0039] The above-described battery cell 10 effectively optimizes the temporary connection problem, suppresses power loss due to the temporary connection, reduces the risk of reliability degradation of the solar power generation module, and effectively controls the problem of micro-cracks in the battery cell 10, reduces losses in the battery cell 10, and reduces the performance degradation rate of the solar power generation module.

[0040] In some embodiments, the second direction is the extension direction of the metal interconnect strip, and the first direction is perpendicular to the second direction. For example, as shown in FIG. 1, the first direction may be the length direction of the battery cell 10, and the second direction may be the width direction of the battery cell 10.

[0041] 2 , the plurality of front-side connecting work positions 100 and the plurality of back-side connecting work positions 200 correspond one-to-one along the first direction, the plurality of first connecting portions 101 constitute first connecting members, the plurality of second connecting portions 201 constitute second connecting members, and at least one set of corresponding first connecting members at the front-side connecting work positions 100 and second connecting members at the back-side connecting work positions 200 are distributed with offset positions along the second direction in the thickness direction of the battery cell 10. Preferably, the first connecting members at each set of corresponding front-side connecting work positions 100 and second connecting members at the back-side connecting work positions 200 are distributed with offset positions along the second direction in the thickness direction of the battery cell 10.

[0042] In some embodiments, the first connecting portion 101 is formed by printing, coating, or dispensing.

[0043] In some embodiments, the second connecting portion 201 is formed by printing, coating, or dispensing.

[0044] In some embodiments, the number of surface connection work positions 100 is multiple, for example, two, three, four, five, etc. The number of surface connection work positions 100 may be set appropriately depending on the dimensions of the battery cells 10.

[0045] In some embodiments, the number of front connection operation positions 100 is equal to the number of back connection operation positions 200. The number of back connection operation positions 200 may be a one-to-one fit to the number of front connection operation positions 100.

[0046] In some embodiments, the number of first connection portions 101 at the surface connection work position 100 is multiple, for example, the number of first connection portions 101 at the surface connection work position 100 is two, three, four, five, etc.

[0047] In some embodiments, the number of second connection portions 201 at the backside connection work position 200 is multiple, for example, the number of second connection portions 201 at the backside connection work position 200 is two, three, four, five, etc.

[0048] In some embodiments, as shown in FIG. 2, along a first direction, the first surface connection work position 100 is aligned with the first back surface connection work position 200, and the last surface connection work position 100 is aligned with the last back surface connection work position 200.

[0049] In some embodiments, as shown in FIG. 2, along the first direction, the other multiple surface connection work positions 100 between the first surface connection work position 100 and the last surface connection work position 100 are distributed offset from the other multiple surface connection work positions 100 between the first back surface connection work position 200 and the last back surface connection work position 200.

[0050] 2, the number of front surface connection work positions 100 and the number of back surface connection work positions 200 are each 18. Here, the first front surface connection work position 100 is aligned with the first back surface connection work position 200, and the 18th front surface connection work position 100 is aligned with the 18th back surface connection work position 200. The second to seventeenth front surface connection work positions 100 are misaligned with the second to seventeenth back surface connection work positions 200, respectively.

[0051] In some embodiments, the spacing between two adjacent surface-connecting work positions 100 is equal, as shown in Figure 2. The spacing between two adjacent surface-connecting work positions 100 can be set according to actual needs.

[0052] In some embodiments, the spacing between two adjacent backside connection work positions 200 is equal, as shown in Figure 2. The spacing between two adjacent backside connection work positions 200 can be set according to actual needs.

[0053] In some embodiments, the spacing between two adjacent front surface connection work positions 100 is equal to the spacing between two adjacent back surface connection work positions 200. This setting makes it easier to design the distribution of corresponding press plates and press pins in the printing and crimping processes.

[0054] For example, in one specific embodiment, as shown in Figure 2, the number of front surface connection work positions 100 and the number of back surface connection work positions 200 are each 18. Here, the first front surface connection work position 100 is aligned with the first back surface connection work position 200, and the 18th front surface connection work position 100 is aligned with the 18th back surface connection work position 200. The second to seventeenth surface connection work positions 100 are misaligned with the second to seventeenth back surface connection work positions 200, respectively, and the intervals between two adjacent surface connection work positions 100 are equal, the intervals between two adjacent back surface connection work positions 200 are equal, and the second to seventeenth surface connection work positions 100 are misaligned with the second to seventeenth back surface connection work positions 200, respectively. Therefore, the interval H1 between two adjacent surface connection work positions 100 and the interval H1 between two adjacent back surface connection work positions 200 are equal, but the interval H2 between the 16th back surface connection work position 200 and the 17th back surface connection work position 200 is set to be different, and as shown in Figure 2, the interval H2 between the 16th back surface connection work position 200 and the 17th back surface connection work position 200 is used to compensate for the misalignment.

[0055] In some embodiments, the first connection portion 101 may have a dotted shape, a line shape, or a combination of dotted and line shapes. When the first connection portion 101 has a dotted and line shape, the specific combination can be set as needed. When the first connection portion 101 has a line shape, the length of the line can be set as needed.

[0056] In some embodiments, the second connection portion 201 may have a dotted shape, a line shape, or a combination of dotted and line shapes. When the second connection portion 201 has a dotted and line shape, the specific combination can be set as needed. When the second connection portion 201 has a line shape, the length can be set as needed.

[0057] As shown in Fig. 1, the first connection portion 101 shown in Fig. 1 has a dot shape. Preferably, the second connection portion 201 has a dot shape.

[0058] In some embodiments, as shown in FIGS. 1 and 3, the spacing between two adjacent first connection portions 101 at the surface connection operation position 100 is equal.

[0059] In some embodiments, the spacing between two adjacent second connection portions 201 at the backside connection operation position 200 is equal.

[0060] In some embodiments, the spacing between two adjacent first connecting portions 101 is equal to the spacing between two adjacent second connecting portions 201 .

[0061] In some embodiments, the height of the first connecting portion 101 can be set according to actual needs, for example, the height of the first connecting portion 101 is 0.1 mm to 10 mm.

[0062] In some embodiments, the height of the second connecting portion 201 can be set according to actual needs, for example, the height of the second connecting portion 201 is 0.1 mm to 10 mm.

[0063] In some embodiments, when the spacing between two adjacent first connection portions 101 at each surface connecting work position 100 is equal, the spacing in the second direction between the first connection portion 101 at one of the two adjacent surface connecting work positions 100 and the offset first connection portion 101 at the other of the two adjacent surface connecting work positions 100 is equal to half the spacing between the two adjacent first connection portions 101. As can be understood, in other embodiments, the distance at which the multiple first connection portions 101 at the two adjacent surface connecting work positions 100 are offset can be set as needed.

[0064] An embodiment of the present application further provides a solar cell.

[0065] The solar cell includes metal interconnection strips, adhesive members, and a plurality of battery cells 10. The plurality of battery cells 10 are distributed in order. Two adjacent battery cells 10 are connected to each other via a plurality of metal interconnection strips. Adhesive members are provided on a plurality of first connection portions 101 at a front connection work position 100 of the battery cells 10. Adhesive members are provided on a plurality of second connection portions 201 at a back connection work position 200 of the battery cells 10. A portion of the metal interconnection strip is connected to the adhesive member at the front connection work position 100 of one of the adjacent battery cells 10. Another portion of the metal interconnection strip is connected to the adhesive member at the back connection work position 200 of the other adjacent battery cell 10.

[0066] In some embodiments, when the solar cell is a busbar-less or thin busbar cell, the metal interconnect strips are electrically connected to the thin electrodes or thin busbars on the front or back surface of the battery cell 10.

[0067] In some embodiments, the solar cell further includes a front panel, a front adhesive film, a rear panel, and a rear adhesive film, which are partially stacked in order, with multiple battery cells 10 stacked between the front adhesive film and the rear adhesive film. Here, the front panel may be a front glass plate, and the rear panel may be a rear glass plate.

[0068] In some embodiments, the adhesive member may be in the form of glue dots, sticky tape, or other forms.

[0069] An embodiment of the present application further provides a photovoltaic module.

[0070] The photovoltaic module includes a solar cell.

[0071] In some embodiments, the solar cell module further includes a package frame. The solar cell is packaged in the package frame. The number of package frames may be one or more. The length of the package frame may be set according to actual needs.

[0072] As described above, the present application employs offset printing of adhesive dots on the front and back surfaces of the battery cells 10 by changing the adhesive dot positions on adjacent busbar electrodes, thereby reducing shadows during EL testing, avoiding power abnormalities in the solar photovoltaic module, and improving the reliability of the solar photovoltaic module. By changing the adhesive dot positions on the front and back surfaces of the battery cells 10, the present application achieves a reliable bond between the metal interconnect strips and the adhesive dots, avoiding temporary connections, alleviating the problem of micro-cracks in the battery cells 10 during the manufacturing process, and reducing the rate of performance degradation of the solar photovoltaic module.

[0073] In the above embodiments, the description of each embodiment has its own emphasis, and for parts that are not described in detail in one embodiment, reference can be made to the relevant descriptions of other embodiments.

[0074] The technical features of the above embodiments can be combined in any way, and for the sake of brevity, not all possible combinations of the technical features in the above embodiments are described, but as long as there is no contradiction in the combination of these technical features, they should be considered within the scope described in this specification.

[0075] The above examples only show some embodiments of the present application, and although the description is specific and detailed, it should not be understood as limiting the scope of the patent of the present application. It should be noted that a person skilled in the art can make many modifications and improvements without departing from the concept of the present application, all of which fall within the scope of protection of the present application. Therefore, the scope of protection of the patent of the present application should be determined based on the scope of the appended claims. [Explanation of symbols]

[0076] 10 battery cells 100 Surface connection work position 101 First connection part 200 Back connection position 201 Second connection part.

Claims

1. A battery cell (10), A plurality of surface connection work positions (100) are provided on the surface of the battery cell (10), the plurality of surface connection work positions (100) being distributed at intervals along a first direction from one side of the battery cell (10) to the opposite other side, and each of the surface connection work positions (100) has a plurality of first connection parts (101) distributed at intervals along a second direction; a plurality of back surface connection work positions (200) are provided on the back surface of the battery cell (10), the plurality of back surface connection work positions (200) being distributed at intervals along the first direction, and each of the back surface connection work positions (200) having a plurality of second connection parts (201) distributed at intervals along the second direction; A battery cell in which the multiple first connection portions (101) at adjacent surface connection work positions (100) are distributed with a mutual offset, and / or the multiple second connection portions (201) at two adjacent back surface connection work positions (200) are distributed with a mutual offset.

2. The battery cell of claim 1 , wherein the second direction is an extension direction of a metal interconnect strip, and the first direction is perpendicular to the second direction.

3. 2. The battery cell of claim 1, wherein the plurality of surface connection work positions (100) and the plurality of back surface connection work positions (200) correspond one-to-one along the first direction, the plurality of first connection portions (101) constitute first connection members, the plurality of second connection portions (201) constitute second connection members, and at least one pair of corresponding first connection members on the surface connection work positions (100) and second connection members on the back surface connection work positions (200) are distributed with offset positions along the second direction in the thickness direction of the battery cell (10).

4. The battery cell according to claim 1 , wherein the first connection portion (101) is formed by printing, coating, or dispensing.

5. The battery cell according to claim 1 , wherein the second connection portion (201) is formed by printing, coating, or dispensing.

6. The battery cell according to claim 1 , wherein the first connection portion (101) has a dot-like shape, a line-like shape, or a combination of a dot-like shape and a line-like shape.

7. The battery cell according to claim 1 , wherein the second connection portion (201) has a dot-like shape, a line-like shape, or a combination of a dot-like shape and a line-like shape.

8. The battery cell according to any one of claims 1 to 7, wherein the spacing between two adjacent surface connection work locations (100) is equal.

9. The battery cell according to any one of claims 1 to 7, wherein the distance between two adjacent back surface connection work positions (200) is equal.

10. The battery cell according to any one of claims 1 to 7, characterized in that the spacing between two adjacent front surface connection work positions (100) and the spacing between two adjacent back surface connection work positions (200) are equal.

11. The battery cell according to any one of claims 1 to 7, wherein the intervals between two adjacent first connection portions (101) at the surface connection operation position (100) are equal.

12. The battery cell according to any one of claims 1 to 7, wherein the intervals between two adjacent second connection portions (201) at the rear surface connection work position (200) are equal.

13. The battery cell according to any one of claims 1 to 7, wherein the spacing between two adjacent first connection portions (101) and the spacing between two adjacent second connection portions (201) are equal.

14. A solar cell, a metal interconnect strip, an adhesive member, and a plurality of battery cells (10) according to any one of claims 1 to 7; a plurality of the battery cells (10) arranged in sequence, each of two adjacent battery cells (10) being connected by a plurality of the metal interconnection strips, the adhesive member being provided on a plurality of the first connection portions (101) on the front connection work position (100) of the battery cell (10), and the adhesive member being provided on a plurality of the second connection portions (201) on the back connection work position (200) of the battery cell (10), a portion of the metal interconnection strip being connected to the adhesive member on the front connection work position (100) of one of the two adjacent battery cells (10), and another portion of the metal interconnection strip being connected to the adhesive member on the back connection work position (200) of the other of the two adjacent battery cells (10).

15. A photovoltaic module comprising the solar cell of claim 14.

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